I've noticed a bit of hiss with my new HK Signature 2.0 preamp/processor. It's slightly noticable at a 5 ft listening distance. I took out the trusty SPL meter, and at a distance of about 0.5" from the tweeter of a Paradigm Monitor 9 I get about 52 dB (the meter only goes down to 50). This remains consistant over a wide volume range, no matter what input is selected. It's hooked up to a Sig 2.1 amp, which is NOT contributing to the noise. EDIT - I should add that I'm using the latest software, 2.10a. The unit is (temporarily) plugged directly into the wall until I get a good power conditioner. Is this normal, in particular for this preamp?